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<table width="100%" summary="page for geophones"><tr><td>geophones</td><td style="text-align: right;">R Documentation</td></tr></table>

<h2>Seismic Timing Data</h2>

<h3>Description</h3>

<p>The <code>geophones</code> data frame has 56 rows and 2 columns.
Thickness of a layer of Alberta substratum as measured by
a line of geophones.
</p>


<h3>Usage</h3>

<pre>geophones</pre>


<h3>Format</h3>

<p>This data frame contains the following columns:
</p>

<dl>
<dt>distance</dt><dd><p>location of geophone.</p>
</dd>
<dt>thickness</dt><dd><p>time for signal to pass through substratum.</p>
</dd>
</dl>



<h3>Examples</h3>

<pre>
plot(geophones)
lines(lowess(geophones, f=.25))
</pre>


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